Suggest Diet Foods For Alopecia Males

Hello, When I was 4 years old I lost all my hair I am a guy and I am currently 16 years old. I was diagnosed with alopecia and that was it. It has affected my life deeply because it makes me really insecure and people always stare. Its really troubling, is there a cure? What causes this? The only hair I have is public hair and a small mustache hair(s). I have heard it is because of immune system problems but wasn't sure, is their some kind of diet I can get back on to? Thanks!
CJ Carpenter